CN109448643A - Liquid crystal display device and backlight brightness regulation method - Google Patents
Liquid crystal display device and backlight brightness regulation method Download PDFInfo
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- CN109448643A CN109448643A CN201811626588.6A CN201811626588A CN109448643A CN 109448643 A CN109448643 A CN 109448643A CN 201811626588 A CN201811626588 A CN 201811626588A CN 109448643 A CN109448643 A CN 109448643A
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- 238000000034 method Methods 0.000 title claims abstract description 55
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 18
- 238000005286 illumination Methods 0.000 claims abstract description 45
- 238000012545 processing Methods 0.000 claims abstract description 32
- 238000007493 shaping process Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 abstract description 14
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- 238000010586 diagram Methods 0.000 description 15
- 230000006870 function Effects 0.000 description 4
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- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
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- 238000004891 communication Methods 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
It includes: image processing unit, backlight driving unit and back light unit that the embodiment of the present application, which provides a kind of liquid crystal display device and backlight brightness regulation method, the liquid crystal display device,.Wherein, image processing unit is used to send control signal to backlight driving unit, wherein control signal includes duty cycle information and current information (peak point current for being used to indicate back light unit)；Further, backlight driving unit determines duty cycle information and current information according to control signal, and according to duty cycle information and current information, adjusts the backlight illumination of back light unit.In the embodiment of the present application, on the basis of being controlled the backlight brightness by duty cycle information, backlight driving unit can also adjust the backlight illumination of back light unit according to current information, the further expansion adjusting range of backlight illumination, so as to meet HDR technology backlight illumination adjusting range demand, the display effect of HDR can be improved.
Description
Technical field
This application involves field of display technology more particularly to a kind of liquid crystal display devices and backlight brightness regulation method.
Background technique
With the development of display technology, high dynamic illumination rendering (High-Dynamic Range, HDR) has become at present
Mainstream display technology.Wherein, HDR technology needs the adjusting range of backlight illumination as big as possible, to realize the display effect of HDR.
In the prior art, display equipment usually passes through pulse width modulation (Pulse Width Modulation, PWM) letter
Number duty cycle information, being switched on or off for backlight is controlled, to realize adjustment to backlight illumination.
But in the prior art, in such a way that duty cycle information controls the backlight brightness, the adjusting range of backlight illumination is limited,
The demand of the backlight illumination adjusting range of HDR technology may be unable to satisfy.
Summary of the invention
The embodiment of the present application provides a kind of liquid crystal display device and backlight brightness regulation method, solve in the prior art by
It is limited in the adjusting range of backlight illumination, the technical issues of being unable to satisfy the backlight illumination adjusting range demand of HDR technology.
In a first aspect, the embodiment of the present application provides a kind of liquid crystal display device, comprising: image processing unit, backlight drive
Unit and back light unit；The backlight driving unit is connect with described image processing unit and the back light unit respectively；
Wherein, described image processing unit, for sending control signal to the backlight driving unit；Wherein, the control
Signal processed includes duty cycle information and current information, and the current information is used to indicate the peak point current of the back light unit；
The backlight driving unit, for determining that the duty cycle information and the electric current are believed according to the control signal
Breath, and according to the duty cycle information and the current information, adjust the backlight illumination of the back light unit.
In one possible implementation, the backlight driving unit is specifically used for:
According to the duty cycle information, being switched on or off for backlight in the back light unit is adjusted；
According to the current information, the peak point current of backlight in the back light unit is adjusted.
In one possible implementation, the backlight driving unit is also used to:
It handles current information progress digital-to-analogue conversion DAC to obtain information of voltage；
According to the information of voltage, the peak point current of backlight in the back light unit is adjusted.
In one possible implementation, the control signal includes coded portion and dimming portion, wherein the volume
Code part is used to indicate the current information, and the dimming portion is used to indicate the duty cycle information.
In one possible implementation, the coded portion includes: at least one code field, wherein it is described extremely
A few code field is used to indicate the current information.
In one possible implementation, the backlight driving unit is specifically used for:
Shaping filter is carried out to the control signal, obtains the dimming portion；
The duty cycle information is determined according to the dimming portion.
In one possible implementation, the backlight driving unit is specifically used for:
First decoding process is carried out to the control signal, obtains the coded portion；
Second decoding process is carried out to the coded portion, determines the current information.
Second aspect, the embodiment of the present application provide a kind of backlight brightness regulation method, comprising:
Receive control signal；Wherein, the control signal includes duty cycle information and current information, and the current information is used
In instruction peak point current；
The duty cycle information and the current information are determined according to the control signal；
According to the duty cycle information and the current information, backlight illumination is adjusted.
In one possible implementation, described according to the duty cycle information and the current information, adjust backlight
Brightness, comprising:
According to the duty cycle information, being switched on or off for backlight is adjusted；
According to the current information, the peak point current of backlight is adjusted.
In one possible implementation, described that the peak point current of backlight is adjusted according to the current information, packet
It includes:
It handles current information progress digital-to-analogue conversion DAC to obtain information of voltage；
According to the information of voltage, the peak point current of backlight is adjusted.
In one possible implementation, the control signal includes coded portion and dimming portion, wherein the volume
Code part is used to indicate the current information, and the dimming portion is used to indicate the duty cycle information.
In one possible implementation, the coded portion includes: at least one code field, wherein it is described extremely
A few code field is used to indicate the current information.
In one possible implementation, the duty cycle information is determined according to the control signal, comprising:
Shaping filter is carried out to the control signal, obtains the dimming portion；
The duty cycle information is determined according to the dimming portion.
In one possible implementation, the current information is determined according to the control signal, comprising:
First decoding process is carried out to the control signal, obtains the coded portion；
Second decoding process is carried out to the coded portion, determines the current information.
Liquid crystal display device and backlight brightness regulation method provided by the present application, by image processing unit to backlight drive
Unit sends control signal, wherein control signal includes that duty cycle information and current information (are used to indicate the peak value of back light unit
Electric current)；Further, backlight driving unit determines duty cycle information and current information according to the control signal received, and
According to duty cycle information and current information, the backlight illumination of back light unit is adjusted.As it can be seen that comparing and passing through duty in the prior art
Than the mode that information controls the backlight brightness, in the embodiment of the present application, on the basis of being controlled the backlight brightness by duty cycle information,
Backlight driving unit can also adjust the backlight illumination of back light unit, the further expansion tune of backlight illumination according to current information
Whole range, so as to meet HDR technology backlight illumination adjusting range demand, the display effect of HDR can be improved.
Detailed description of the invention
Figure 1A is application scenarios schematic diagram provided by the embodiments of the present application；
Figure 1B is the pwm signal of the prior art and the contrast schematic diagram of pwm signal provided by the embodiments of the present application；
Fig. 1 C is the schematic diagram of coded portion provided by the embodiments of the present application；
Fig. 2A is the structural schematic diagram of liquid crystal display device provided by the embodiments of the present application；
Fig. 2 B is the current waveform schematic diagram of backlight provided by the embodiments of the present application；
Fig. 3 is the flow diagram for the backlight brightness regulation method that one embodiment of the application provides；
Fig. 4 is the flow diagram for the backlight brightness regulation method that another embodiment of the application provides；
Fig. 5 is the flow diagram for the backlight brightness regulation method that another embodiment of the application provides.
Specific embodiment
Firstly, application scenarios involved in the embodiment of the present application and part vocabulary are introduced.
Figure 1A is application scenarios schematic diagram provided by the embodiments of the present application.As shown in Figure 1A, the invention relates to
Liquid crystal display device can include but is not limited to: image processing unit, backlight driving unit and back light unit；Certainly, may be used also
To include other components, such as sequence controller and display panel (such as liquid crystal display panel) etc., in the embodiment of the present application simultaneously to this
With no restriction.
Illustratively, image processing unit carries out image procossing to video signal and obtains after receiving video signal
Image data；Further, image data is exported to sequence controller and is shown with will pass through display panel by image processing unit,
And control signal is exported to adjust the backlight illumination of back light unit to backlight driving unit.
It can include but is not limited to backlight in back light unit involved in the embodiment of the present application.
Backlight involved in the embodiment of the present application can include but is not limited to: light emitting diode (light emitting
Diode, LED) lamp string.
Control signal involved in the embodiment of the present application can include but is not limited to: carrying current information and (is used to indicate
The peak point current of back light unit) pwm signal.
Control signal involved in the embodiment of the present application may include coded portion and dimming portion, wherein coded portion
It is used to indicate current information, dimming portion is used to indicate duty cycle information.For ease of description, the following embodiments of the application are to control
For signal processed is the pwm signal for carrying current information, the structure of control signal is introduced:
Figure 1B is the pwm signal of the prior art and the contrast schematic diagram of pwm signal provided by the embodiments of the present application.Such as Figure 1B
In shown in (a), duty cycle information is only carried in the pwm signal of the prior art, to adjust the unlatching of backlight in back light unit
Or shutdown；It in contrast, include being used to indicate electric current letter as shown in (b) in Figure 1B, in pwm signal provided by the embodiments of the present application
The coded portion of breath and the dimming portion for being used to indicate duty cycle information, so as in the adjustment back light unit backlight open
On the basis of opening or turning off, the peak point current of backlight in back light unit can also be adjusted.
Coded portion involved in the embodiment of the present application can include but is not limited to: be used to indicate at least the one of current information
A code field.Illustratively, the combination of at least one code field can indicate at least one hexadecimal number to refer to
Show current information.
Illustratively, current information is carried in order on the basis of guaranteeing that back light source brightness is stablized, realize in control signal,
Coding mapping relationship shown in table 1 can be used in the embodiment of the present application, and (table 1 is coding mapping provided by the embodiments of the present application pass
It is schematic table), by the balance code (i.e. 1 that hexadecimal effective information corresponding 4 bit-binary Information expansion is 8 bits
Number and 0 number are certain), the effective duty cycle that may be implemented to control under different current informations in signal is certain
's.
Table 1 is coding mapping relationship schematic table provided by the embodiments of the present application
For example, it is assumed that coded portion includes: code field 1 and code field 2, wherein code field 1 is " 10011100 "
(i.e. Hex code is 9C) actually represents hexadecimal " 1 ", and code field 2 is that " 11011000 " (i.e. Hex code is D8) actually represents ten
Senary " C " so that backlight driving unit according to code field 1 and code field 2 determine respectively hexadecimal data " 1 " and
" C ", to know that its corresponding decimal data is " 28 ".
Optionally, for the ease of identifying the position of at least one code field, volume involved in the embodiment of the present application
The first synchronization field before can also including: at least one code field described in code part is (described in being used to indicate extremely
The open position of a few code field), and the second synchronization field after at least one described code field (is used for
Indicate the end position of at least one code field).
It should be noted that if the length of at least one field is preset length, then involved in the embodiment of the present application
Coded portion in can not have to include the second synchronization field.Fig. 1 C is the signal of coded portion provided by the embodiments of the present application
Figure.As shown in Figure 1 C, coded portion may include the first synchronization field and two code fields (such as code field 1 and coded words
Section is 2)；Wherein, code field 1 is that " 10011100 " represent hexadecimal data " 1 ", and code field 2 is " 11011000 " representative
Hexadecimal data " C ".
Number " first " and " second " in the embodiment of the present application etc. are to be used to distinguish similar objects, without being used for
The specific sequence of description or precedence should not constitute any restriction to the embodiment of the present application.
Liquid crystal display device and backlight brightness regulation method provided by the embodiments of the present application, are supported or opposed by image processing unit
Optical drive unit sends the control signal for carrying duty cycle information and current information, realizes and controls by duty cycle information
On the basis of backlight illumination, backlight driving unit can also be according in the current information dynamic adjustment back light unit in control signal
The peak point current of backlight is further realized and is adjusted to the backlight illumination of back light unit, to solve in the prior art
Since the adjusting range of backlight illumination is limited, the technical issues of being unable to satisfy the backlight illumination adjusting range demand of HDR technology.
How the technical solution of the application and the technical solution of the application are solved with specifically embodiment below above-mentioned
Technical problem is described in detail.These specific embodiments can be combined with each other below, for the same or similar concept
Or process may repeat no more in certain embodiments.
Fig. 2A is the structural schematic diagram of liquid crystal display device provided by the embodiments of the present application.As shown in Figure 2 A, the application is real
The liquid crystal display device 20 for applying example offer may include: image processing unit 201, backlight driving unit 202 and back light unit
203；Wherein, backlight driving unit 202 is connect with image processing unit 201 and back light unit 203 respectively.
Illustratively, image processing unit 201 can be sent out after receiving video signal to backlight driving unit 202
Send control signal；Wherein, control signal may include that duty cycle information and current information (are used to indicate the peak of back light unit 203
It is worth electric current).
Illustratively, control signal involved in the embodiment of the present application can include but is not limited to: carry current information
Pwm signal.
Illustratively, control signal involved in the embodiment of the present application may include as shown in Figure 1B being used to indicate electric current
The coded portion of information and the dimming portion for being used to indicate duty cycle information.
Coded portion involved in the embodiment of the present application can include but is not limited to: be used to indicate at least the one of current information
A code field.Illustratively, the combination of at least one code field can indicate at least one hexadecimal number to refer to
Show current information.
Optionally, for the ease of identifying the position of at least one code field, volume involved in the embodiment of the present application
The first synchronization field before can also including: at least one code field described in code part is (described in being used to indicate extremely
The open position of a few code field), and the second synchronization field after at least one described code field (is used for
Indicate the end position of at least one code field).It should be noted that if the length of at least one field is pre-
If length, then can not have to include the second synchronization field in coded portion involved in the embodiment of the present application.
Illustratively, backlight driving unit 202 is used to determine duty cycle information and electric current according to the control signal received
Information, and according to duty cycle information and current information, adjust the backlight illumination of back light unit 203.
In the embodiment of the present application, since control signal may include being used to indicate the coded portion of current information and for referring to
Show the dimming portion of duty cycle information, then backlight driving unit 202 can according to control signal determine respectively coded portion and
Dimming portion, to correspondingly determine duty cycle information and current information.
Optionally, backlight driving unit 202 can carry out shaping filter to control signal and obtain dimming portion, and according to tune
Determine duty cycle information in light part.Specifically, backlight driving unit 202 can use plastic filter circuit in the prior art
Shaping filter is carried out to control signal, to this and is not construed as limiting in the embodiment of the present application.
Optionally, backlight driving unit 202 can carry out the first decoding process to control signal and obtain coded portion, and right
Coded portion carries out the second decoding process, determines current information.Illustratively, backlight driving unit 202 is default according to first
It decodes regular (the predeterminated position rule of such as coded portion) and the first decoding process is carried out to get coding unit to control signal
Point；Further, backlight driving unit 202 is according to the second default decoding rule (predeterminated position rule or volume of such as code field
Coding mapping relationship shown in the position instruction rule of code field and above-mentioned table 1 etc.) coded portion is carried out at the second decoding
Reason, so that it is determined that current information out.
For example, it is assumed that coded portion includes: code field 1 and code field 2, wherein code field 1 is " 10011100 "
(i.e. Hex code is 9C) actually represents hexadecimal " 1 ", and code field 2 is that " 11011000 " (i.e. Hex code is D8) actually represents ten
Senary " C ", then backlight driving unit 202 can determine hexadecimal data according to code field 1 and code field 2 respectively
" 1 " and " C ", to know that current information is decimal data " 28 " corresponding to hexadecimal data " 1 " and " C ".
Certainly, backlight driving unit 202 can also determine duty cycle information and electricity according to control signal otherwise
Stream information, in the embodiment of the present application to this and with no restriction.
In the embodiment of the present application, backlight driving unit 202 can be according to the duty cycle information and electricity that control signal is determined
Information of the stream information in terms of the two is realized and is adjusted to the backlight illumination of back light unit 203.
Optionally, on the one hand, backlight driving unit 202 can adjust backlight in back light unit 203 according to duty cycle information
Source is switched on or off, to realize that the backlight illumination to back light unit 203 adjusts.Illustratively, when duty cycle information is high electricity
Usually, then backlight driving unit 202 controls the backlight unlatching in back light unit 203；When duty cycle information is low level, then
Backlight driving unit 202 controls the backlight shutdown in back light unit 203.
Optionally, on the other hand, backlight driving unit 202 can adjust backlight in back light unit 203 according to current information
The peak point current in source.
Illustratively, current information can be carried out digital-to-analogue conversion (digital to by backlight driving unit 202
Analog converter, DAC) processing obtains information of voltage, and adjusts backlight in back light unit 203 according to information of voltage
Peak point current (such as by information of voltage as the reference voltage to realize that the peak point current to backlight in back light unit 203 carries out
Dynamic adjusts.
Illustratively, backlight driving unit 202 can be true according to current information, predetermined reference voltage and default feedback resistance
The peak point current of backlight in back light unit 203 is made, to realize the dynamic to the peak point current of backlight in back light unit 203
Adjustment.For example, backlight driving unit 202 can according to current information I, predetermined reference voltage Vref and default feedback resistance Rf,
Formula I0=(I/B) * Vref/Rf can be used, determines the peak point current I0 of backlight in back light unit 203；Wherein, if I
It is 10 bits (bit) data, then B is equal to 1024；If I is 8bit data, B is equal to 256.
Certainly, backlight driving unit 203 can also be adopted according to current information, predetermined reference voltage and default feedback resistance
The peak point current of backlight in back light unit 203 is determined with other deformations of above-mentioned formula or equivalent formulation, the application is implemented
In example to this and with no restriction.
Fig. 2 B is the current waveform schematic diagram of backlight provided by the embodiments of the present application.As shown in Figure 2 B, the application is implemented
It, can also basis on the basis of being switched on or off of backlight in duty cycle information dynamic adjustment back light unit 203 in example
The peak point current of backlight in current information dynamic adjustment back light unit 203, to realize the backlight illumination to back light unit 203
It is adjusted.
Liquid crystal display device provided by the embodiments of the present application is sent to backlight driving unit by image processing unit and is controlled
Signal, wherein control signal includes duty cycle information and current information (peak point current for being used to indicate back light unit)；Further
Ground, backlight driving unit determines duty cycle information and current information according to the control signal received, and is believed according to duty ratio
Breath and current information, adjust the backlight illumination of back light unit.As it can be seen that comparing and passing through duty cycle information control back in the prior art
The mode of brightness, in the embodiment of the present application, on the basis of being controlled the backlight brightness by duty cycle information, backlight driving unit
It can also adjust the backlight illumination of back light unit according to current information, the further expansion adjusting range of backlight illumination, thus
The demand that can satisfy the backlight illumination adjusting range of HDR technology, can be improved the display effect of HDR.
Fig. 3 is the flow diagram for the backlight brightness regulation method that one embodiment of the application provides.As shown in figure 3, this Shen
Please the method for embodiment include:
Step S301, control signal is received.
Illustratively, the control signal in the embodiment of the present application may include duty cycle information and current information (for referring to
Show peak point current).
Step S302, the duty cycle information and the current information are determined according to the control signal.
Step S303, according to the duty cycle information and the current information, backlight illumination is adjusted.
Backlight brightness regulation method provided by the embodiments of the present application, the liquid crystal that can be provided by the above embodiments of the present application
Showing device realizes that specific implementation can be with reference to the related content in the application above-mentioned liquid crystal display device embodiment, this
Place repeats no more.
In one possible implementation, described according to the duty cycle information and the current information, adjust backlight
Brightness, comprising:
According to the duty cycle information, being switched on or off for backlight is adjusted；
According to the current information, the peak point current of backlight is adjusted.
In one possible implementation, described that the peak point current of backlight is adjusted according to the current information, packet
It includes:
It handles current information progress digital-to-analogue conversion DAC to obtain information of voltage；
According to the information of voltage, the peak point current of backlight is adjusted.
In one possible implementation, the control signal includes coded portion and dimming portion, wherein the volume
Code part is used to indicate the current information, and the dimming portion is used to indicate the duty cycle information.
In one possible implementation, the coded portion includes: at least one code field, wherein it is described extremely
A few code field is used to indicate the current information.
In one possible implementation, the duty cycle information is determined according to the control signal, comprising:
Shaping filter is carried out to the control signal, obtains the dimming portion；
The duty cycle information is determined according to the dimming portion.
In one possible implementation, the current information is determined according to the control signal, comprising:
First decoding process is carried out to the control signal, obtains the coded portion；
Second decoding process is carried out to the coded portion, determines the current information.
Backlight brightness regulation method provided by the embodiments of the present application, by carrying duty cycle information and electric current in control signal
Information (is used to indicate peak point current), realizes on the basis of being controlled the backlight brightness by duty cycle information, can also basis
Control the peak point current that the current information dynamic in signal adjusts backlight, the further expansion adjusting range of backlight illumination,
So as to meet HDR technology backlight illumination adjusting range demand, the display effect of HDR can be improved.
Fig. 4 is the flow diagram for the backlight brightness regulation method that another embodiment of the application provides.In above-described embodiment
On the basis of, it include: that power supply subelement, PWM processing subelement and PWM dim son to backlight driving unit in the embodiment of the present application
For unit, above-mentioned backlight brightness regulation method is introduced.As shown in figure 4, the method for the present embodiment may include:
S1, PWM handle subelement and receive the control signal that image processing unit is sent.
S2, PWM handle subelement according to control signal, determine duty cycle information and current information.
Illustratively, PWM handles subelement and carries out shaping filter acquisition dimming portion to control signal, thus according to light modulation
Determine duty cycle information in part.
Illustratively, PWM handles subelement and is decoded processing (such as the first decoding process and the second decoding to control signal
Processing), so that it is determined that current information out.
S3, PWM handle subelement and duty cycle information are sent to PWM light modulation subelement.
S4, PWM handle subelement and handle to obtain information of voltage to current information progress DAC, and information of voltage is sent to
PWM dims subelement.
S5, PWM, which dim subelement and adjust backlight in back light unit according to duty cycle information, to be switched on or off, and according to
Information of voltage as the reference voltage Vref with realize in back light unit backlight peak point current carry out dynamic adjustment.
As it can be seen that compared to the prior art, PWM light modulation subelement is normally set up a fixed reference feedback voltage and (passes through
What the resistance value of default feedback resistance Rf determined), the peak point current so as to cause back light unit be it is fixed, duty ratio can only be passed through
Information adjusts backlight illumination.In the embodiment of the present application, duty cycle information and current information are carried by control signal, realized
On the basis of adjusting backlight illumination by duty cycle information, PWM dims subelement and can also be carried on the back according to current information dynamic adjustment
The peak point current of light unit is so as to adjust backlight illumination, the further expansion adjusting range of backlight illumination, so as to meet
The demand of the backlight illumination adjusting range of HDR technology.
Fig. 5 is the flow diagram for the backlight brightness regulation method that another embodiment of the application provides.In above-described embodiment
On the basis of, it include: that power supply subelement, backlight processing subelement and PWM drive to backlight driving unit in the embodiment of the present application
For subelement, above-mentioned backlight brightness regulation method is introduced.As shown in figure 5, the method for the present embodiment may include:
S1, backlight processing subelement receive the control signal that image processing unit is sent.
S2, backlight processing subelement determine duty cycle information and current information according to control signal.
Illustratively, backlight processing subelement carries out shaping filter to control signal and obtains dimming portion, thus according to tune
Determine duty cycle information in light part.
Illustratively, backlight processing subelement is decoded processing (such as the first decoding process and the second solution to control signal
Code processing), so that it is determined that current information out.
Duty cycle information and current information are sent to PWM driving subelement by S3, backlight processing subelement.
S4, PWM drive subelement to adjust backlight in back light unit according to duty cycle information and are switched on or off, and according to
Current information, predetermined reference voltage Vref and default feedback resistance Rf determine the peak point current of back light unit, to realize to back
The dynamic adjustment of the peak point current of backlight in light unit.
Optionally, the PWM driving subelement in the present embodiment is cascaded by more backlight driving chips, and every backlight is driven
Dynamic chip can drive multi-way control signals to corresponding backlight.
In the embodiment of the present application, duty cycle information and current information are carried by control signal, realizes and is passing through duty
On the basis of adjusting backlight illumination than information, PWM drives subelement can also be according to current information dynamic adjustment back light unit
Peak point current is so as to adjust backlight illumination, the further expansion adjusting range of backlight illumination, so as to meet HDR technology
The demand of backlight illumination adjusting range.
One with ordinary skill in the art would appreciate that in the various embodiments of the application, the serial number of above-mentioned each process
Size is not meant that the order of the execution order, and the execution sequence of each process should be determined by its function and internal logic, without answering
Any restriction is constituted to the implementation process of the embodiment of the present application.
In several embodiments provided herein, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be tied
Another system is closed or is desirably integrated into, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or logical of device or unit
Letter connection can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of hardware adds SFU software functional unit.
The above-mentioned integrated unit being realized in the form of SFU software functional unit can store and computer-readable deposit at one
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are used so that a computer
It is each that equipment (can be personal computer, server or the network equipment etc.) or processor (processor) execute the application
The part steps of embodiment the method.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (Read-
Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic or disk etc. it is various
It can store the medium of program code.
Those skilled in the art can be understood that, for convenience and simplicity of description, only with above-mentioned each functional module
Division progress for example, in practical application, can according to need and above-mentioned function distribution is complete by different functional modules
At the internal structure of device being divided into different functional modules, to complete all or part of the functions described above.On
The specific work process for stating the device of description, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above-mentioned each method embodiment can lead to
The relevant hardware of program instruction is crossed to complete.Program above-mentioned can be stored in a computer readable storage medium.The journey
When being executed, execution includes the steps that above-mentioned each method embodiment to sequence；And storage medium above-mentioned include: ROM, RAM, magnetic disk or
The various media that can store program code such as person's CD.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the application, rather than its limitations；To the greatest extent
Pipe is described in detail the application referring to foregoing embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, each embodiment technology of the application that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (14)
1. a kind of liquid crystal display device characterized by comprising image processing unit, backlight driving unit and back light unit；Institute
Backlight driving unit is stated to connect with described image processing unit and the back light unit respectively；
Wherein, described image processing unit, for sending control signal to the backlight driving unit；Wherein, the control letter
It number include duty cycle information and current information, the current information is used to indicate the peak point current of the back light unit；
The backlight driving unit, for determining the duty cycle information and the current information according to the control signal, and
According to the duty cycle information and the current information, the backlight illumination of the back light unit is adjusted.
2. the apparatus according to claim 1, which is characterized in that the backlight driving unit is specifically used for:
According to the duty cycle information, being switched on or off for backlight in the back light unit is adjusted；
According to the current information, the peak point current of backlight in the back light unit is adjusted.
3. the apparatus of claim 2, which is characterized in that the backlight driving unit is also used to:
It handles current information progress digital-to-analogue conversion DAC to obtain information of voltage；
According to the information of voltage, the peak point current of backlight in the back light unit is adjusted.
4. the apparatus according to claim 1, which is characterized in that the control signal includes coded portion and dimming portion,
Wherein, the coded portion is used to indicate the current information, and the dimming portion is used to indicate the duty cycle information.
5. device according to claim 4, which is characterized in that the coded portion includes: at least one code field,
In, at least one described code field is used to indicate the current information.
6. device according to claim 4 or 5, which is characterized in that the backlight driving unit is specifically used for:
Shaping filter is carried out to the control signal, obtains the dimming portion；
The duty cycle information is determined according to the dimming portion.
7. device according to claim 3 or 4, which is characterized in that the backlight driving unit is specifically used for:
First decoding process is carried out to the control signal, obtains the coded portion；
Second decoding process is carried out to the coded portion, determines the current information.
8. a kind of backlight brightness regulation method characterized by comprising
Receive control signal；Wherein, the control signal includes duty cycle information and current information, and the current information is for referring to
Show peak point current；
The duty cycle information and the current information are determined according to the control signal；
According to the duty cycle information and the current information, backlight illumination is adjusted.
9. according to right want 8 described in method, which is characterized in that it is described according to the duty cycle information and the current information,
Adjust backlight illumination, comprising:
According to the duty cycle information, being switched on or off for backlight is adjusted；
According to the current information, the peak point current of backlight is adjusted.
10. according to the method described in claim 9, adjusting the peak of backlight it is characterized in that, described according to the current information
It is worth electric current, comprising:
It handles current information progress digital-to-analogue conversion DAC to obtain information of voltage；
According to the information of voltage, the peak point current of backlight is adjusted.
11. according to the method described in claim 8, it is characterized in that, the control signal includes coded portion and dimming portion,
Wherein, the coded portion is used to indicate the current information, and the dimming portion is used to indicate the duty cycle information.
12. according to the method for claim 11, which is characterized in that the coded portion includes: at least one code field,
Wherein, at least one described code field is used to indicate the current information.
13. method according to claim 11 or 12, which is characterized in that determine the duty ratio according to the control signal
Information, comprising:
Shaping filter is carried out to the control signal, obtains the dimming portion；
The duty cycle information is determined according to the dimming portion.
14. method according to claim 11 or 12, which is characterized in that determine that the electric current is believed according to the control signal
Breath, comprising:
First decoding process is carried out to the control signal, obtains the coded portion；
Second decoding process is carried out to the coded portion, determines the current information.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811626588.6A CN109448643A (en) | 2018-12-28 | 2018-12-28 | Liquid crystal display device and backlight brightness regulation method |
| CN202110773143.6A CN113380202A (en) | 2018-12-28 | 2018-12-28 | Liquid crystal display device and backlight brightness adjusting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811626588.6A CN109448643A (en) | 2018-12-28 | 2018-12-28 | Liquid crystal display device and backlight brightness regulation method |
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| CN202110773143.6A Division CN113380202A (en) | 2018-12-28 | 2018-12-28 | Liquid crystal display device and backlight brightness adjusting method |
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| CN202110773143.6A Pending CN113380202A (en) | 2018-12-28 | 2018-12-28 | Liquid crystal display device and backlight brightness adjusting method |
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| WO2022022290A1 (en) * | 2020-07-30 | 2022-02-03 | 惠州视维新技术有限公司 | Led driving method, display device, and readable storage medium |
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| CN113380202A (en) | 2021-09-10 |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Applicant after: Hisense Visual Technology Co., Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Applicant before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |
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Application publication date: 20190308 |